Improvement in drop-presses



[UNITED STATES BENNET HOTCHKISS, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN DROP-PRESSES.

Specification forming part o. Letters Paten.' No. $7,692, dated February 17, 1863.'

T0 all whom z'v may concern.'

Beit known that I, BENNET Llo'rcHKrss, of

the city and county ot' New H-aven,.and State of Connecticut, have invented new andusefnl Improvements in Drop-Presses; and I do mechanism whereby-I am enabled to instantly release my drop at any point `in its ascent de- A sired by theoperator, for the purpose of giving heavier or lighter blows, as the work may require.

To enable others skilledinthe art... to con.-` vvstruct and operate my invention, I will proceed to describe my manner of so doing.

A is the anvil, also supports the drop B v A.and its operative mechanism.

The upper part or frame C is constructed so as to form guides c c to receive and guide the drop B. Y

D is a strap, or its equivalent attached its lower end to the drop B, the other passes up and between the pulleys E and F. The pulley E isxed to a shaft, a, driven by another v pulley G, also fixed to the same shaft, and to .which I apply the power to operate the drop.

b is a cogwheel,.xed' to the saine shaft a, and engages into another cog-wheel, d, fixed tothe pulley F, which is loose upon an eccentric-shaft, H, the eccentric bearings e of which restin boxes I. To this eccentric-shaft H (see Fig. 3) Lattach and tix a lever, L, for the purpose of turning it on its eccentric bearings to force the'loose pulley F toward the fixed pulley E and against the strap D- with sutcient'force to hold-- the strap firmly between the two pulleys, which, when so held, will, by -therevolntious of the two pulleys in the direction denoted by arrows, draw the strap D and Athe-drop B,`t0 which it is attached, upward,

and when the'eccentricshat't is returned by raising the ,lever L, as shown in red, Fig. 3,

will release the pressure upon the strap, when the drop Vwill fall..

fis a springllatch to catch and hold the.

lever L down, 'as shown in Fig. 3 in black,

when the pulley F shall have lbeen pressedwith sufficient force against the strap to raise the drop, beforedescribed.

Misa rod. its upper end attached to the lever L by a slot, g, and on which are fixed adjustable stopsh and fi, for the purpose of operating` the eccentric-shaft to force the pulley-F to and from the pulley E.

N is a projection from .the drop, which in the ascent of thedrop strikes the stop h and, raises the rodM, (see Fig. l in red,) which by a projection, In, (seeFig. 3,) formed on the rod for the purpose, presses back the spring-latch f, as shown in red, Fig. 3, and releases the lever L, which raises in consequence. of the overbalancing ot' its longer arm, 0, or by a weiglit'or spring thereto attached. The slot gb in the upper end .of the rod M is to allow time to operate the latch f to release the lever .L -more .suddenlythari "the ascending drop otherwise could do, and therefore causing an instantaneous release of the pressure upon the strap, when the drop will fall from its full` height withoutresistance, whereas were the pressure gradually released, the drop would begin its descent before a full release had tak en place, and a consequent resistance would attend the drop during a portion ot' its descent. In the descent of the drop the projection N strikes the stop and draws down the rod M, and through its connection the lever `L into the latch f, as shown in black, Fig-3, when the stra-p is again graspedl between the two pulleys as before.

P is a trip hung to the adjustable block R.

o is a spring to hold the trip up, as shown in black, Fig. 1. ln the ascent of the drop the projection N strikes the inner end ot' the trip P', and raises and passes it, when, if the trip is allowed, it will spring back under the projection N and catch the drop immediately after its release, (see Fig'lv in h1ue,) where it will remain until the trip is drawn down, as shown in blue, Fig'l, when the drop will fall, and, strikingtlie Stop i, will again be raised, as before describeth-and so continue to be raised and fall" until the trip is allowed to spring back to catch it and hold. it up When itis desired to make the blows heavier, the

stop'h must be raised andA reset on the rod M by the set-screw r ata point to give the desired length of stroke, or, if for a vlighter blow, must be lowered accordingly. The slide 'to .which isi-hung the trip Pis also adjustable oi'Ix the frame C, and fixed in place by a set-screw, s,and shouldbe raised or lowered, so as always to be in about the saine relative 'position to the stop h. By this arrangement I am enabled to obtain any required length of stroke to the extreme height ot the guides, and to strike very'r'apid blows .in consequence of the impossibility of the pulleys catching the strap until the drop has fallen so iar as to strike the stop z' to close the pulleys upon the strap, 'while drops driven by cranks are confined to a iixed length of stroke'and alimited velocity, as a too rapid revolution of the crank will -catch the drop before it has completed its descent. lhe stop t' is adjustable, and may be raised or lowered, the Work muy require.

"When at rest, the drop is in the position as .shown in blue, Fig. l, andl when to be used, place the work upon the anvil A, set the foot in the 'stirrup T and draw the trip P away to allow the drop to fall, wh-ioh,.as before shown, will be immediately raised, and so continue to fall and be raised till the 4trip is'released and 'springs back to catch it in its descent.-

I illustrate my invention as having the power applied to the shaft having a iixed center, but it may be applied to either or bothv with the same result and Without, departure from the-principlesherein setforth. Therefore Having fully described my invention, what Ielaim therein as new and useful'isl. The eccentric pulleyT F, in combination with the pulley E, when the same operate in themanner and for the purpose, substantially .as herein set forth.-

2. Thev eccentric pulley F and drop A, when the same are combined, substantially for the purpose as herein specified. y

3. The lever L andlatch f, when the same are combined in the manner described, with Ehe eccentric pulley F,ffor the purpose specied. Y

4. The combination of the lever L and latch fwith-a drop, substantially as herein described.

5. The rod M,Witl1 its adjustablc'stops h and-z', in combination with the levervL and l'atch'f,substantiallyin the manner and for the purpose herein set forth.

6. The adjustable trip, in vcombination with a drop., 'substantially as and for the purpose specified.

Witnesses: BENNET Ho'roniriss.'l

.4 HoRAoE Hummm.,

JOHN E. EARLE.

general principles herein con- 

